Measurement of the tt¯ production cross-section in the lepton+jets channel at √s = 13 TeV with the ATLAS experiment Aguilar Saavedra, Juan Antonio Atlas Collaboration, / The top anti-top quark production cross-section is measured in the lepton+jets channel using proton– proton collision data at a centre-of-mass energy of √s = 13 TeV collected with the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 139 fb−1. Events with exactly one charged lepton and four or more jets in the final state, with at least one jet containing b-hadrons, are used to determine the tt¯ production cross-section through a profile-likelihood fit. The inclusive cross-section is measured to be σinc = 830 ± 0.4 (stat.) ± 36 (syst.) ± 14 (lumi.) pb with a relative uncertainty of 4.6%. The result is consistent with theoretical calculations at next-to-next-to-leading order in perturbative QCD. The fiducial tt¯ cross-section within the experimental acceptance is also measured. 2021-02-01T11:57:28Z 2021-02-01T11:57:28Z 2020 journal article ATLAS collaboration. (2020). Measurement of the tt¯ production cross-section in the lepton+ jets channel at s= 13 TeV with the ATLAS experiment. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 810. DOI 10.1016/j.physletb.2020.135797 http://hdl.handle.net/10481/66173 10.1016/j.physletb.2020.135797 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España ELSEVIER